No. 30: Kinder Morgan, Houston: Fortune said Kinder Morgan, which is ranked 265 overall, made approximately $10.2 billion in revenue in 2012.

No. 30: Kinder Morgan, Houston: Fortune said Kinder Morgan, which is ranked 265 overall, made approximately $10.2 billion in revenue in 2012.

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Wal-Mart back as leader of the giants

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Wal-Mart Stores again overtook Exxon Mobil Corp. as the No. 1 company on the Fortune 500 as the chain's discount prices continued to draw frugal shoppers, the magazine reported Monday.

The world's biggest retailer and the world's largest publicly traded energy company have flip-flopped between the No. 1 and No.2 positions on the annual list in recent years. General Motors is the only other company to have made No. 1 on the Fortune list since 1955.

While Wal-Mart's sales of $469.2 billion topped Exxon Mobil's, the retailer's profit margin was much slimmer at 3.6 percent.

Exxon Mobil posted a profit of $44.9 billion on sales of $449.5 billion in 2012, or 10 percent.

Rounding out the top 5 are Chevron, Phillips 66 and Berkshire Hathaway.

The number of Houston-based companies on the Fortune 500 held steady at 25.

Phillips 66, the refining arm that spun out of ConocoPhillips last year, came in at No. 4 with $169.6 billion in revenue. It took the spot previously occupied by ConocoPhillips, which is now solely an exploration and production company.

More Information

Houston's biggest companies

The annual Fortune 500 list includes 25 companies based in greater Houston:

The annual Fortune 500 list includes 25 companies based in greater Houston:

Revenue 2012 Revenue Rank Company in 2012* rank in 2011*

4 Phillips 66 $169.6 NR NA

45 ConocoPhillips 63.4 4 $237.3

64 Enterprise Products Partners 42.6 62 44.3

65 Sysco 42.4 69 39.3

77 Plains All American Pipeline 37.8 87 34.3

106 Halliburton 28.5 18 24.8

135 Baker Hughes 21.4 141 19.8

144 National Oilwell Varco 20.0 184 14.7

167 Apache 17.1 154 16.9

174 Marathon Oil 16.2 173 15.3

200 Waste Management 13.6 203 13.4

207 Anadarko Petroleum 13.4 19214.0

233 EOG Resources 11.7 263 10.1

265 Kinder Morgan 10.2 311 8.3

310 Cameron International 8.5 362 7.0

334 KBR 7.9 280 9.3

343 Group 1 Automotive 7.5 405 6.1

344 CenterPoint Energy 7.5 305 8.5

381 Enbridge Energy Partners 6.7 282 9.1

397 Quanta Services 6.4 513 NA

417 FMC Technologies 6.2 475 5.1

435 Targa Resources 5.9 361 7.0

451 MRC Global 5.6 493 4.8

459 Calpine 5.5 364 6.8

475 Spectra Energy5.2 438 5.6

* billions

Source: Fortune 500

Top of the top

The 10 biggest companies on the Fortune 500 list:

1Wal-Mart

2Exxon Mobil

3Chevron

4Phillips 66

5Berkshire Hathaway

6Apple

7General Motors

8General Electric

9Valero Energy

10Ford

Source: Fortune 500

ConocoPhillips dropped to No. 45, with $63.4 billion in revenue.

New to the list in 2013 is Houston-based Quanta Services, which ranked No. 397 with revenue of $6.4 billion. The company provides contracting services for electric power, natural gas and pipeline projects. Last year, it missed the list by ranking No. 513.

Houston companies that fell off the list this year were CVR Energy (No. 477 in 2012), and El Paso Corp. (No. 488 last year).

The combined revenue of the 25 Houston-area companies on the 2013 Fortune 500 list was $580.8 billion. That's up from $571.5 billion for the 25 companies on the 2012 list.

Out of 24 Houston-area companies on the 2013 Fortune 500 list, 13 moved up in the ranking, while 11 moved down.